EP0884542A1 - Outdoor unit of air conditioner - Google Patents

Outdoor unit of air conditioner Download PDF

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Publication number
EP0884542A1
EP0884542A1 EP97911481A EP97911481A EP0884542A1 EP 0884542 A1 EP0884542 A1 EP 0884542A1 EP 97911481 A EP97911481 A EP 97911481A EP 97911481 A EP97911481 A EP 97911481A EP 0884542 A1 EP0884542 A1 EP 0884542A1
Authority
EP
European Patent Office
Prior art keywords
grille
crest
outdoor unit
vanes
sawtoothed
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP97911481A
Other languages
German (de)
French (fr)
Other versions
EP0884542B1 (en
EP0884542A4 (en
Inventor
Zhiming Zheng
Seiji Sato
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Daikin Industries Ltd
Original Assignee
Daikin Industries Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Daikin Industries Ltd filed Critical Daikin Industries Ltd
Publication of EP0884542A1 publication Critical patent/EP0884542A1/en
Publication of EP0884542A4 publication Critical patent/EP0884542A4/en
Application granted granted Critical
Publication of EP0884542B1 publication Critical patent/EP0884542B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F13/00—Details common to, or for air-conditioning, air-humidification, ventilation or use of air currents for screening
    • F24F13/08—Air-flow control members, e.g. louvres, grilles, flaps or guide plates
    • F24F13/082—Grilles, registers or guards
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F1/00—Room units for air-conditioning, e.g. separate or self-contained units or units receiving primary air from a central station
    • F24F1/06—Separate outdoor units, e.g. outdoor unit to be linked to a separate room comprising a compressor and a heat exchanger
    • F24F1/56—Casing or covers of separate outdoor units, e.g. fan guards
    • F24F1/58—Separate protective covers for outdoor units, e.g. solar guards, snow shields or camouflage
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F13/00—Details common to, or for air-conditioning, air-humidification, ventilation or use of air currents for screening
    • F24F13/08—Air-flow control members, e.g. louvres, grilles, flaps or guide plates
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F13/00—Details common to, or for air-conditioning, air-humidification, ventilation or use of air currents for screening
    • F24F13/24—Means for preventing or suppressing noise

Definitions

  • the present invention relates to an outdoor unit for air conditioners which has an air outlet grille of a special vane structure.
  • an air outlet grille 2 on the front side is structured into a grid shape consisting of grille vanes 2a, 2a, ... for enhancement of the appearance (beauty) of an outdoor unit 1.
  • the grille vanes 2a, 2a, ... of the air outlet grille 2 each have a cross section of a generally elliptical wing shape, for example, as shown in Figs. 8 and 9 (see, for example, Japanese Patent Laid-Open Publication HEI 5-93531).
  • Such a wing-shaped cross section of the grille vane 2a, 2a, ... makes it possible to prevent the breakaway of air flow at a front edge portion 3a of the grille vane while suppressing low both interferential noise due to interference with the flow of air blown off from an impeller 42 via a fan guide 41 and breakaway noise due to the breakaway.
  • the outdoor unit for air conditioners is characterized in that a front edge of wing-shaped grille vanes provided in an air outlet grille of an outdoor unit casing is formed into a sawtoothed structure.
  • each crest of the sawtoothed portion makes it less likely that the flow in the front edge of the grille vanes breaks away, and also makes the handling during assembly safer. Furthermore, it has been confirmed that forming the height of each crest of the sawtoothed portion to a dimensional value of 0.05 to 0.25 times the length of vanes (chord length) or forming the crest-to-crest pitch of the sawtoothed portion to a dimensional value of 0.5 to 1.5 times the height of the crest itself improves the aforementioned functions particularly effectively.
  • Figs. 1 and 2 show the vane structure of an air outlet grille of an outdoor unit for air conditioners according to an embodiment of the present invention.
  • reference numeral 2a denotes grille vanes constituting a grid-shaped air outlet grille 2 of the outdoor unit 1 for air conditioners with an appearance configuration similar to that of Figs. 6 and 7 as described before.
  • This grille vane 2a as shown in Fig. 2, has a cross section of a generally elliptical wing-shaped structure generally similar to that of the conventional one shown in Fig. 9 as a whole. However, its front edge portion 3a is formed into a sawtoothed portion 5 as shown in Fig. 1 over its entire lateral width.
  • the sawtoothed portion 5 as shown in Fig. 2 has crests 5a, 5a, ... each formed at the tip into a rounded portion having a specified curvature across the front and rear faces.
  • the crest height H from the bottom of troughs 5b, 5b, ... to the tip of the crests 5a, 5a, ... is 0.05 to 0.25 times the length (chord length) L of grille vane 2a
  • the present invention is applied to grille vanes at the air outlet grille of an outdoor unit for air conditioners.

Abstract

A sawtoothed portion 5 is provided in a front edge 3a of grille vanes 2a constituting an air outlet grille of an outdoor unit. Each crest 5a of the sawtoothed portion 5 is rounded at its tip. The height H of each crest of the sawtoothed portion 5 is set to a size of 0.05 to 0.25 times the length of the wing-shaped grille vane (chord length), and the crest-to-crest pitch S of the sawtoothed portion 5 is set to a size of 0.5 to 1.5 times the height H of each crest. As a result, there arise numerous longitudinal eddies from troughs 5b of the sawtoothed portion 5, so that an air flow of high flow rate at places away from the negative-pressure surface of the grille vanes 2a can be drawn near the negative-pressure surface. Thus, the flow on the negative-pressure surface side is unlikely to break away, and noise is reduced.

Description

TECHNICAL FIELD
The present invention relates to an outdoor unit for air conditioners which has an air outlet grille of a special vane structure.
BACKGROUND ART
Conventionally, in most outdoor units for air conditioners, for example as shown in Figs. 6 and 7, an air outlet grille 2 on the front side is structured into a grid shape consisting of grille vanes 2a, 2a, ... for enhancement of the appearance (beauty) of an outdoor unit 1. Then, the grille vanes 2a, 2a, ... of the air outlet grille 2 each have a cross section of a generally elliptical wing shape, for example, as shown in Figs. 8 and 9 (see, for example, Japanese Patent Laid-Open Publication HEI 5-93531).
Such a wing-shaped cross section of the grille vane 2a, 2a, ... makes it possible to prevent the breakaway of air flow at a front edge portion 3a of the grille vane while suppressing low both interferential noise due to interference with the flow of air blown off from an impeller 42 via a fan guide 41 and breakaway noise due to the breakaway.
However, blown-off air that is actually blown off from the impeller 42 via the fan guide 41 has strong turning components so that the blown-off air impinges on the grille vane 2a at a specified angle  as shown in Fig. 9, almost all over the grille surface of the air outlet grille 2 shown in Fig. 6. As a result, there would arise a large breakaway of air flow as shown in Fig. 9 on the rear side of the air that impinge on the grille vane 2a at the specified angle , i.e., on the negative-pressure surface side, causing a large breakaway noise as a disadvantage.
DISCLOSURE OF THE INVENTION
It is an object of the present invention to provide an outdoor unit for air conditioners which includes an air outlet grille having grille vanes that allow the noise due to breakaway of blown-off air to be reduced by suppressing the breakaway on the negative-pressure surface side of blown-off air that impinges obliquely.
In order to achieve the above object, the outdoor unit for air conditioners according to the present invention is characterized in that a front edge of wing-shaped grille vanes provided in an air outlet grille of an outdoor unit casing is formed into a sawtoothed structure.
Thus, by forming the front edge of the grille vanes into a sawtoothed structure, there arise numerous small-scaled longitudinal eddies from troughs of the sawtoothed portion so that an air flow of high flow rate at places away from the negative-pressure surface of the grille vanes can be drawn near the negative-pressure surface of the grille vanes. As a result, the flow on the negative-pressure surface side of the grille vanes is unlikely to break away so that the breakaway noise can be reduced further than it could conventionally.
Also, rounding the tip of each crest of the sawtoothed portion makes it less likely that the flow in the front edge of the grille vanes breaks away, and also makes the handling during assembly safer. Furthermore, it has been confirmed that forming the height of each crest of the sawtoothed portion to a dimensional value of 0.05 to 0.25 times the length of vanes (chord length) or forming the crest-to-crest pitch of the sawtoothed portion to a dimensional value of 0.5 to 1.5 times the height of the crest itself improves the aforementioned functions particularly effectively.
BRIEF DESCRIPTION OF THE DRAWINGS
  • Fig. 1 is an enlarged plan view showing the structure of the grille vane of an outdoor unit for air conditioners according to an embodiment of the present invention;
  • Fig. 2 is a sectional view taken along the line II - II of Fig. 1;
  • Fig. 3 is a graph showing the relationship between the ratio of crest height of the sawtoothed portion to grille vane length (H/L) in the grille vanes and the noise level;
  • Fig. 4 is a graph showing the relationship between the ratio of crest-to-crest pitch to crest height of the sawtoothed portion in the grille vanes and the noise level;
  • Fig. 5 is a graph showing the relationship between noise level and air flow rate of the grille vanes according to the embodiment of the present invention, in contrast to a prior art;
  • Fig. 6 is a front view showing the structure of an outdoor unit for air conditioners and its air outlet grille according to the prior art;
  • Fig. 7 is a sectional view taken along the line VII - VII of Fig. 6;
  • Fig. 8 is a plan view of the grille vane in the air outlet grille of the prior-art outdoor unit; and
  • Fig. 9 is a sectional view taken along the line IX - IX of Fig. 8.
    • BEST MODE FOR CARRYING OUT THE INVENTION
    Figs. 1 and 2 show the vane structure of an air outlet grille of an outdoor unit for air conditioners according to an embodiment of the present invention.
    Referring to Figs. 1 and 2, reference numeral 2a denotes grille vanes constituting a grid-shaped air outlet grille 2 of the outdoor unit 1 for air conditioners with an appearance configuration similar to that of Figs. 6 and 7 as described before. This grille vane 2a, as shown in Fig. 2, has a cross section of a generally elliptical wing-shaped structure generally similar to that of the conventional one shown in Fig. 9 as a whole. However, its front edge portion 3a is formed into a sawtoothed portion 5 as shown in Fig. 1 over its entire lateral width.
    Then, the sawtoothed portion 5 as shown in Fig. 2 has crests 5a, 5a, ... each formed at the tip into a rounded portion having a specified curvature across the front and rear faces. Moreover, the crest height H from the bottom of troughs 5b, 5b, ... to the tip of the crests 5a, 5a, ... is 0.05 to 0.25 times the length (chord length) L of grille vane 2a, and the lateral array pitch S of the crests 5a, 5a, ... with the troughs 5b, 5b, ... interposed therebetween is set to 0.5 to 1.5 times the height H of the crests (S/H = 0.5 to 1.5).
    Like this, with a sawtoothed structure of the front edge portion 3a of the grille vane 2a in view of reducing the breakaway of air flow on the negative-pressure surface side, which is the rear side with respect to the direction in which air impinges on the grille vanes 2a in the air outlet grille 2, there arise small-scaled longitudinal eddies from the troughs 5b, 5b, ... of the sawtoothed portion 5, as shown in Fig. 2, so that the air flow of high flow velocity at places away from the negative-pressure surface of the grille vanes 2a of the air outlet grille 2 can be drawn near the negative-pressure surface of the grille vanes 2a, making it unlikely that the flow on the negative-pressure surface side breaks away. As a result, breakaway noise is reduced effectively in contrast with the conventional grille vanes.
    To verify such functional effects, with the aforementioned numerical relationships (H/L = 0.05 - 0.25 or S/H = 0.5 - 1.5) adopted for the grille vanes 2a independently of each other, actual measurement of the noise level on these grille vanes was carried out and their results are shown in Figs. 3 and 4. From these charts, it can be understood that in the range of H/L = 0.05 - 0.25 or S/H = 0.5 - 1.5, the noise level is particularly low, hence a high noise-reduction effect.
    Further, noise level was measured with various grille vanes that fell within the above ranges of H/L and S/H, and their measured values are as shown in Fig. 5, in comparison with the noise level under the conventional grille vane structure shown in Figs. 6 to 9. From Fig. 5, it can be seen that the grille vanes of the structure according to the present embodiment are lower in noise level by approximately 0.7 dB, regardless of the air flow rate, producing a higher noise-reduction effect.
    As described above, according to the outdoor unit for air conditioners which adopts the grille vanes of the present invention, breakaway of air flow on the negative-pressure surface side of the grille vanes on which blown-off air impinges obliquely can be suppressed. As a result, noise due to the breakaway of air flow at the grille vanes can be reduced remarkably as compared with the prior art, so that improvement in the quietness performance of the outdoor unit for air conditioners can be achieved.
    INDUSTRIAL APPLICABILITY
    The present invention is applied to grille vanes at the air outlet grille of an outdoor unit for air conditioners.

    Claims (4)

    1. An outdoor unit for air conditioners, characterized in that a sawtoothed portion is formed in a front edge of wing-shaped grille vanes provided in an air outlet grille of an outdoor unit casing.
    2. The outdoor unit for air conditioners according to Claim 1, wherein each crest of the sawtoothed portion is rounded at its tip.
    3. The outdoor unit for air conditioners according to Claim 1 or 2, wherein height of each crest of the sawtoothed portion is set to a size of 0.05 to 0.25 times the length of each wing-shaped grille vane.
    4. The outdoor unit for air conditioners according to any one of Claims 1 to 3, wherein a crest-to-crest pitch of the sawtoothed portion is set to a size of 0.5 to 1.5 times the height of the crest itself.
    EP97911481A 1996-12-16 1997-11-07 Outdoor unit of air conditioner Expired - Lifetime EP0884542B1 (en)

    Applications Claiming Priority (4)

    Application Number Priority Date Filing Date Title
    JP8335448A JP3052862B2 (en) 1996-12-16 1996-12-16 Outdoor unit for air conditioner
    JP33544896 1996-12-16
    JP335448/96 1996-12-16
    PCT/JP1997/004059 WO1998027390A1 (en) 1996-12-16 1997-11-07 Outdoor unit of air conditioner

    Publications (3)

    Publication Number Publication Date
    EP0884542A1 true EP0884542A1 (en) 1998-12-16
    EP0884542A4 EP0884542A4 (en) 2000-03-29
    EP0884542B1 EP0884542B1 (en) 2003-05-07

    Family

    ID=18288680

    Family Applications (1)

    Application Number Title Priority Date Filing Date
    EP97911481A Expired - Lifetime EP0884542B1 (en) 1996-12-16 1997-11-07 Outdoor unit of air conditioner

    Country Status (12)

    Country Link
    EP (1) EP0884542B1 (en)
    JP (1) JP3052862B2 (en)
    KR (1) KR100453318B1 (en)
    CN (1) CN1106545C (en)
    AU (1) AU719177B2 (en)
    DE (1) DE69721739T2 (en)
    ES (1) ES2198557T3 (en)
    HK (1) HK1016247A1 (en)
    ID (1) ID21219A (en)
    PT (1) PT884542E (en)
    SA (1) SA97180747B1 (en)
    WO (1) WO1998027390A1 (en)

    Cited By (8)

    * Cited by examiner, † Cited by third party
    Publication number Priority date Publication date Assignee Title
    EP2508815A1 (en) * 2011-04-08 2012-10-10 TROX GmbH Device for influencing a flow of air in a component of an air conditioning assembly
    DE102012213930A1 (en) * 2012-08-07 2014-02-13 BSH Bosch und Siemens Hausgeräte GmbH Blower with air inlet nozzle for swirling air flow and air inlet nozzle for a blower
    US20150093983A1 (en) * 2013-10-02 2015-04-02 Lg Electronics Inc. Indoor device for cassette type air conditioner
    US20180206610A1 (en) * 2015-07-24 2018-07-26 Koninklijke Philips N.V. Hair care device
    US10047972B2 (en) 2013-10-02 2018-08-14 Lg Electronics Inc. Indoor device for cassette type air conditioner
    US10203124B2 (en) 2014-01-27 2019-02-12 Lg Electronics Inc. Indoor device for air conditioner having wind visors
    US10203150B2 (en) 2013-10-11 2019-02-12 Lg Electronics Inc. Indoor device for air conditioner
    EP3492831A1 (en) * 2017-11-30 2019-06-05 Toyota Jidosha Kabushiki Kaisha Register

    Families Citing this family (6)

    * Cited by examiner, † Cited by third party
    Publication number Priority date Publication date Assignee Title
    SE533313C2 (en) * 2008-12-22 2010-08-24 Atlas Copco Rock Drills Ab Cooling system intended for cooling at least one circulating fluid, and a machine comprising the cooling system
    KR101435007B1 (en) * 2013-04-22 2014-08-28 반석공조시스템(주) Noise reduction Louver
    CN103292441B (en) * 2013-06-25 2016-03-30 吉林大学 Bionical noise reduction air conditioner grid
    CN105588231B (en) * 2015-03-31 2019-07-23 青岛海信日立空调系统有限公司 A kind of air-conditioner outdoor unit air exhausting structure
    CN107388424A (en) * 2017-08-04 2017-11-24 广东美的制冷设备有限公司 Outlet housing and air-conditioner outdoor unit
    JP2021080851A (en) * 2019-11-15 2021-05-27 株式会社マキタ Blower

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    Publication number Priority date Publication date Assignee Title
    US4976115A (en) * 1989-08-21 1990-12-11 Carrier Corporation Cambered condenser grill
    JPH0593531A (en) * 1991-10-01 1993-04-16 Matsushita Electric Ind Co Ltd Front grille for outdoor apparatus of air conditioner
    EP0711925A1 (en) * 1994-11-08 1996-05-15 Mitsubishi Jukogyo Kabushiki Kaisha Propeller fan

    Family Cites Families (4)

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    Publication number Priority date Publication date Assignee Title
    JPH0267839U (en) * 1988-11-07 1990-05-23
    JP2516634Y2 (en) * 1990-03-19 1996-11-06 松下冷機株式会社 Blowout guider
    JP3337248B2 (en) * 1992-12-03 2002-10-21 三菱重工業株式会社 Propeller fan
    JPH08313006A (en) * 1995-05-17 1996-11-29 Matsushita Electric Ind Co Ltd Front grille for outdoor machine of air conditioner

    Patent Citations (3)

    * Cited by examiner, † Cited by third party
    Publication number Priority date Publication date Assignee Title
    US4976115A (en) * 1989-08-21 1990-12-11 Carrier Corporation Cambered condenser grill
    JPH0593531A (en) * 1991-10-01 1993-04-16 Matsushita Electric Ind Co Ltd Front grille for outdoor apparatus of air conditioner
    EP0711925A1 (en) * 1994-11-08 1996-05-15 Mitsubishi Jukogyo Kabushiki Kaisha Propeller fan

    Non-Patent Citations (2)

    * Cited by examiner, † Cited by third party
    Title
    PATENT ABSTRACTS OF JAPAN vol. 017, no. 430 (M-1460), 10 August 1993 (1993-08-10) & JP 05 093531 A (MATSUSHITA ELECTRIC IND CO LTD), 16 April 1993 (1993-04-16) *
    See also references of WO9827390A1 *

    Cited By (11)

    * Cited by examiner, † Cited by third party
    Publication number Priority date Publication date Assignee Title
    EP2508815A1 (en) * 2011-04-08 2012-10-10 TROX GmbH Device for influencing a flow of air in a component of an air conditioning assembly
    DE102012213930A1 (en) * 2012-08-07 2014-02-13 BSH Bosch und Siemens Hausgeräte GmbH Blower with air inlet nozzle for swirling air flow and air inlet nozzle for a blower
    US20150093983A1 (en) * 2013-10-02 2015-04-02 Lg Electronics Inc. Indoor device for cassette type air conditioner
    US10047972B2 (en) 2013-10-02 2018-08-14 Lg Electronics Inc. Indoor device for cassette type air conditioner
    US10197298B2 (en) * 2013-10-02 2019-02-05 Lg Electronics Inc. Indoor device for cassette type air conditioner
    US10203150B2 (en) 2013-10-11 2019-02-12 Lg Electronics Inc. Indoor device for air conditioner
    US10203124B2 (en) 2014-01-27 2019-02-12 Lg Electronics Inc. Indoor device for air conditioner having wind visors
    US20180206610A1 (en) * 2015-07-24 2018-07-26 Koninklijke Philips N.V. Hair care device
    US10383422B2 (en) * 2015-07-24 2019-08-20 Koninklijke Philips N.V. Hair care device
    EP3492831A1 (en) * 2017-11-30 2019-06-05 Toyota Jidosha Kabushiki Kaisha Register
    CN109849620A (en) * 2017-11-30 2019-06-07 丰田自动车株式会社 Ventilation device

    Also Published As

    Publication number Publication date
    JP3052862B2 (en) 2000-06-19
    DE69721739D1 (en) 2003-06-12
    JPH10176847A (en) 1998-06-30
    CN1106545C (en) 2003-04-23
    PT884542E (en) 2003-09-30
    DE69721739T2 (en) 2004-02-05
    ID21219A (en) 1999-05-06
    KR100453318B1 (en) 2004-12-31
    AU719177B2 (en) 2000-05-04
    KR19990081955A (en) 1999-11-15
    WO1998027390A1 (en) 1998-06-25
    CN1211311A (en) 1999-03-17
    EP0884542B1 (en) 2003-05-07
    AU4885597A (en) 1998-07-15
    SA97180747B1 (en) 2006-08-12
    HK1016247A1 (en) 1999-10-29
    ES2198557T3 (en) 2004-02-01
    EP0884542A4 (en) 2000-03-29

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